Report of the geological exploration of the fortieth parallel (1870)
United States Geological Exploration of the Fortieth Parallel (1867-1881), King, Clarence, 1842-1901, Hague, A. (Arnold), 1840-1917, Emmons, Samuel Franklin, 1841-1911, Hague, James D. (James Duncan), 1836-1908, Meek, F. B. (Fielding Bradford), 1817-1876, Hall, James, 1811-1898, Whitfield, R. P. (Robert Parr), 1828-1910, Ridgway, Robert, 1850-1929, Watson, Sereno, 1826-1892, Eaton, Daniel Cady, 1834-1895, Bien, Julius, 1826-1909, engraver · (Washington, D.C. : G.P.O.) · leaf 406
, which are of frequent occurrence along theFortieth Parallel; thatis, itis a compound of quartz, biotite, hornblende, ortho-clase and plagioclase feldspars, and titanite, with a relatively large proportionof plagioclase, liornblende, and titanite. The crystals of titanite can bereadily seen by the… … ^ GRANITE AND ARCHiEAN ROCKS. 357 The granite of Lone Peak resembles this very closely, but shows alsoa porjjliyritical structure, carrying large crystals of dull white orthoclase iua crystalline matrix. In this, two principal sets of cleavage-planes, at rightangles to each other, are 2>iominentl)…
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